Mechanism for transmitting rotary motion.



.6. s HILL.

MECHANISM FOR TRANSMITTING ROTARY MOTION.- APPLICATION FILED NOV. 1. 1915.

1,200,108. I Patented ,0ct 3, 1916.

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G. s. HILL. MECHANISM FOR'TRANSMITTING ROTARY MOTION.

APPLICATION HLED NOV. 1. 1915. A 1,200,108. Patented Oct. 3,1916.

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GEORGE S. HILL, OF STRAFFORD, NEW HAMPSHIRE, ASSIGNOR TO UNITED SHOE IVIACHINERY COMPANY, OF PATERSON, NEW JERSEY, CORPORATION OF NEW JERSEY.

Specification of Letters Patent.

Patented Oct. 3,1916.

Application filed November 1, 1915. Serial No. 59,037.

To all whom it may concern:

Be it known that I, GEORGE S. IIILL, a citizen of the United States, residing at Straiford, in the county of Strafiord and State of New Hampshire, have invented certain new and useful Improvements in Mechanism for Transmitting Rotary Motion; and I do hereby declare the following to be a full, clear, and exact description of the 1nvention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to mechanism for transmitting motion from one rotary member of a shaft to another.

The invention is intended primarily as an improvement in the mechanism for rotating the sewing mechanism of a buttonhole sewing machine shown and described in Fatent No. 1,063,785, although not confined 1n 1ts application to such mechanism or machine.

In the buttonhole sewing machine of the above patent a variable rotary motion is transmitted to the sewing mechanism from a uniformly rotating disk gear through a controller lever pivoted to the under side of the gear, and acted on by a stationary controller cam diskarranged below the disk gear to leave a narrow space for-the lever and for the connections between the lever and a shaft through which variable motion is transmitted to the sewing mechanism.

The controller lever carries a roll on its under side which projects into a cam groove in the controller cam disk, and the pressure on the roll as the lever is carried around by the disk gear tends to tip the gear and lever and thus cause the parts to bind more or less, with a resulting increase in the wear and strain on the parts.

It is the primary object of the present invention to provide a novel and improved construction which will prevent the tipping of the disk gear and lever and thus avoid undue wear and strain, and insure the easy and accurate running of the parts. To this end the invention contemplates the provision of spacing means between the driving disk gear and opposed faces of the controller cam disk for maintaining the opposed faces of the disks in parallel relation.

For the sake of simplicity it is preferred to provide the controller lever with bearing surfaces on its opposite sides which are arranged. to e g g the opp e fac s of the disks and act as the spacing means, and

it is also preferred to so arrange the spacingbearing surfaces that they will surround the center of the disks and engage the opposed surfaces of the disks comparatively near to their outer edges.

1 The invention will be readily understood from an'inspection of the accompanying drawings and the following detailed description of "the mechanism illustrated therein.

In the drawings, Figure is a sectional elevation showing so'much' of a buttonhole sewing machlne as is necessary to' lllustrate the application of the present improvements through a vertical shaft 2 which is connected by the sprocket bands or chains 4 and 6 with the rotary sleeve 8 in which the upper needle bar 10 is mounted, and with the turret 12 in which the under needle Hand looper 16 are mounted. Variable rotary motion is trans- .mitted to theshaft .2 and through it to the sewing mechanism from a uniformly rotating disk gear 18 which is loosely mounted on the shaft. The mechanism for transmitting variable motion to the shaft 2 comprises a stationary controller cam disk 20 secured in position below the disk gear 18,

and a controller lever 22 pivoted to the disk gear at 24; and carrying a roll 26 which engages a cam groove 28 in the disk 20. In the embodiment of the invention shown the lever is in the form of a skeleton plate consisting of an approximately annular bar which surrounds the central portion of the disks. The bar is provided on opposite sides with bearing surfaces 30 which engage the opposed faces of the disks and form a spacing means for maintaining the faces of the disks in parallel relation, thus preventing any tipping of the disk gear and resulting wear and strain on the parts. The lever plate is preferably of such size that the bearing surfaces engage the opposed faces of the disks at a considerable distance from the disk centers and relatively near to their outer edges as a more effective support is thus given to the disk gear.

The annular bar of the controller lever is provided with two inwardly projecting arms 82, the inner ends of which form a slot 3A in which the pivot block 36 plays. The pivot block is mounted on the end of an arm 38 secured to the shaft 2. As the disk gear rotates, motion is transmitted to the shaft 2 through the lever 22 and arm 38, and the movement of the shaft is retarded and accelerated during the desired portions of each rotation by the action of the controller cam on the lever.

While it is preferred to employ the specific construction and arrangement of parts shown and described in embodying the invention in the machine and mechanism of the patents above referred to, it will be understood that this construction and arrangement is not essential to the broader features of the invention, and may be varied and modified as found desirable or best suited to the construction of the machine in which it is to be embodied.

Having explained the nature and object of the invention, and specifically described one form of mechanism in which it may be embodied, what is claimed is 1. A mechanism for transmitting rotary motion, having, in combination, two disks spaced to receive a lever between them, a lever between the disks pivoted to one disk and acted on by the other, and having spacing surfaces on its opposite sides for engaging the opposed faces of the disks and maintaining them in parallel relation.

2. A mechanism for transmitting rotary motion, having, in combination, a driving disk, a spaced concentric cam disk, a driven shaft, connections in the space between the disks acted on by the cam disk to vary the motion transmitted through the connections from the driving disk to the shaft, and spacing means between the disks for maintaining their opposed faces in parallel relation.

A mechanism for transmitting rotary motion, having, in combination, a driving disk, a spaced concentric cam disk, a lever pivoted to the driving disk and acted upon by the cam disk provided with spacing surfaces engaging the opposed faces of the disks, a driven member, and connections between the lever and the driven member.

4. A mechanism for transmitting rotary motion, having, in combination, a driving disk, a spaced concentric cam disk, a shaft, a skeleton lever plate surrounding the shaft and having bearing surfaces on its opposite sides engaging the opposed faces of the disks, a pivot connecting the lever to the driving disk, a roll on the lever engaging the cam disk, and connections between the lever and shaft.

5. A mechanism for transmitting rotary motion, having, in combination, a rotary driving disk, a concentric cam disk spaced from the driving disk, a controller lever comprising an annular bar surrounding the center portions of the disks and provided on opposite sides with bearing surfaces engaging the opposed faces of the disks, a pivot connecting the lever to the driving disk, inwardly projecting arms on the lever, a bearing block engaged by the ends of the arm,

a shaft concentric with the disks, and an arm on the shaft to which the bearing block is pivoted.

GEORGE S. HILL.

Copies of this patent may be obtained for five cents each, by addressing the commissioner of Patents.

Washington, D. G. 

